Was giving an older computer I no longer use to someone - has MS xp on it. Went through to delete all my personal files off it and saw a folder - "***", my name and thought it just contained my personal stuff. Deleted that folder - appears that there was a lot more there that I should not have deleted.

This XP was on the computer when I purchased it so I have no disc.

Is there any way to fix this?

If I wanted to update to Vista or Win 7 and use an update copy, would this work or does it need all the old XP files to do a clean update?